Set of 6 mat boards for picture frames (※Everything for sale is shown in the first photo.) Color: The specifications of the window openings vary slightly. Please check the photos. Size: Outer dimensions: 20.2cm x 25.3cm Window (inner dimensions): 9.3cm x 14.3cm Thickness: 2mm Material: Cardboard I was keeping these for my own use, but I'm selling some to declutter. ※The front sides are all clean, but there are a few with stains or spots on the back. Please only purchase if you don't mind. (I've uploaded photos of the most noticeable stains in photos 10 and 11, so please check them.) ※This listing is for the mat boards only; frames are not included. Please refrain from purchasing if you are sensitive to items stored at home. #MatBoard #Mat #FrameMat #PictureFrameMat #PictureFrameMatBoard #PhotoFrameMat #ArtFrame #ArtFrameMatBoard